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Merge pull request #782 from chris-jones-arm/mbedtls-2.16-restricted

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[Backport 2.16] Fix Diffie-Hellman large key size DoS
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Janos Follath 2020-12-07 09:27:55 +00:00 • committed by GitHub
commit bcfa41753d
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6 changed files with 106 additions and 4 deletions
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4
library/bignum.c
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@ -2058,6 +2058,10 @@ int mbedtls_mpi_exp_mod( mbedtls_mpi *X, const mbedtls_mpi *A,
if( mbedtls_mpi_cmp_int( E, 0 ) < 0 )
return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
if( mbedtls_mpi_bitlen( E ) > MBEDTLS_MPI_MAX_BITS ||
mbedtls_mpi_bitlen( N ) > MBEDTLS_MPI_MAX_BITS )
return ( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
/*
* Init temps and window size
*/